Benzimidazolyl coumarine fluorescent dyes

ABSTRACT

Dyes of the formula:   OBTAINED FROM THE CORRESPONDING 2-IMINOCOUMARINES BY REACTION WITH A COMPOUND OF THE FORMULA:   The dyes give brilliant yellow to red shades on textile material, particularly polyesters and acrylonitrile polymers.

United States Patent Mach et al.- Sept. 9, 1975 1 1 BENZIMIDAZOLYL COUMARINE 3,681,397 8/1972 Knupfer et al 260/3092 FLUORESCENT DYES 3,766,199 10/1973 Dehnert et a1 .1 260/3092 Inventors: Wolfgang Mach, Hockenheim;

Horst Scheuermann, Ludwigshafen, both of Germany Badische Anilin- & Soda-Fabrik Aktiengesellschaft, Ludwigshafen (Rhine), Germany Filed: Sept. 5, 1972 Appl. No.: 286,416

Assignee:

Foreign Application Priority Data Sept. 7, 1971 Germany 2144591 References Cited UNITED STATES PATENTS 11/1970 Voltz et al. 260/2949 FOREIGN PATENTS OR APPLICATIONS 452,474 5/1968 Switzerland 260/3092 Primary Examiner-Henry R. Jiles Assistant Examiner-S. D. Winters Attorney, Agent, or Firm-J0hn'st0n, Keil, Thompson & Shurtleff Dyes of the formula:

ABSTRACT N 1 CN R obtained from the corresponding 2-iminocoumarines by reaction with a compound of the formula:

The dyes give brilliant yellow to red shades on textile material, particularly polyesters and acrylonitrile polymers.

9 Claims, No Drawings 1. BENZIMIDAZOLYL COUMARINE FLUORESCENT DYES The invention relates to dyes of the formula (I):

1 1/ R R N l O C CN (I) in which R is hydrogen, alkyl of one to four carbon atoms, alkyl of one to four carbon atoms bearing alkoxy. chlorine. bromine. carboxyl. carbalkoxy. carbamoyl or acetoxy as a substituent, cyclohexyl, benzyl or phcnyl; I

R is hydrogen, alkyl of one to four carbon atoms, or alkyl of one to four carbon atoms bearing alkoxy, chlorine, bromine. carboxyl, carbalkoxy, carbamoyl or acetoxy as a substituent;

R and R together with the adjacent nitrogen are the radical of a five-membered or six-membered heter ocyclic ring; Y is earbalkoxy, unsubstituted or substituted carhamoyl or cyano; R is a radical of the formula:

X 'i 3 e R n n S J the l to n X is cyano or nitro;

Z is hydrogen. cyano, chlorine, bromine, methylsulfonyl, ethylsulfonyl, sulfonamido or nitro;

A is hydrogen, methyl, ethyl, fi hydroxyethyl or B-hydroxypropyl;

R is hydrogen or methyl;

R is hydrogen, carbalkoxy, unsubstituted or substituted carbamoyl or cyano;

R is hydrogen, methyl, ethyl, chlorine, methoxy or ethoxy;

n is zero or 1; and

X is an anion.

The following are examples of substituents in addition to those already specified:

For R and R methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, B-methoxyethyl, B-ethoxyethyl, B-acetoxyethyl, B-chloroethyl. B-carbomethoxyethyl, B-carboethoxy ethyl. B-carbobutoxyethyl, ,B-methoxypropyl, B-ethoxypropyl, ,B-methoxy-y-chloropropyl or B-acetoxypropy R and R together with the adjacent nitrogen may be for example the radical of pyrrolidine, piperidine, morpholine, piperazine or N-methylpiperazine.

Examples of specific radicals Y are: carbomethoxy, carboethoxy, carbobutoxy, carbamoyl, l\l alkylcarbamoyl or N.N-dialkylcarbamoyl such as diethylcarbamoyl, ethylearbamoyl, butylcarbamoyl. isooctylcarbamoyl, methylcarbamo yl, dimethylcarbamoyl, dipropylcarbamoyl, dibutylcarbamoyl or N-methyl-N- butylcarbamoyl, carboxanilide, cyclohexylcarbamoyl, benzylcarbamoyl, carboxypyrrolidide, carboxypiperidide, carboxymorpholide, carboxy-N-methylpiperazide.

Cyano is preferred for Yv The same carbalkoxy and carbamoyl radicals as specified for y may be used for R Examples of anions X" are chloride. sulfate. methosulfate. ethosulfate, acetate. ptoluenesulfonate, tetrachlorizincatc and tetrafluoborate.

Dyes of formula (la):

carboxypiperazide and 5 R R N l C CN (Ia) in which \N 0 NH R v with a compound of formula (Ill):

H2CCN (III) and if desired quaternizing the reaction product. R, R, R and Y have the meanings given above. lminocoumarines of formula (II) are known from German Pat. application P, 21,29,5658 and from German Laid-Open Specification No. 1,619,567.

The reaction may conveniently be carried out in a solvent at a temperature of from 50 to 200C, preferably from to C.

Particularly suitable solvents are polar organic solvents, for example glycols and glycol ethers such as ethylene glycol or ethylene glycol monomethyl ether, dimethylformamide or N-methylpyrrolidone; also acetanhydride, if necessary with added alkali metal acetate, glacial acetic acid or mixture of solvents.

The following Examples illustrate the invention. Unless stated otherwise, parts and percentages referred to are by weight.

EXAMPLE 1 The dye of the formula:

is-obtaincd by boiling 4.75 parts of 3-( p-cyanophenyl)- 7-diethyl-2-iminoeoumarine and 0.99 part of malononitrile in 45 parts of glycol monoethyl ether for one hour under reflux, cooling to 5C. and subjecting the precipitate to suction filtration followed by washing with parts of methanol. The yield of yellow crystals is 4.5 parts. The melting point is 247C.

EXAMPLE 2 The dye of the formula is obtained by boiling 5 parts of 3-benzimidaz0lyl(2)- 7-diethylamino-2-iminocoumarine and 1 part of malononitrile in 45 parts of glycol monoethyl ether for ninety minutes under reflux, then cooling to 5C and suction filtering the deposited crystals, washing them with 10 parts of methanol and drying them. The yield of dark red crystals is 3.2 parts and the melting point is 275C.

EXAMPLE 3 The dye of the formula:

U HC CH 52 N o C(CN) 5 HC ca so or its isomer of the probable formula:

is obtained by heating 5.7 parts of the dye from Example 2, 2.52 parts of dimethyl sulfate and 130 parts of o dichlorobenzene for 1 hour at 120C, then cooling to C, suction filtering the precipitate. washing it with petroleum ether and drying it.

The yield of black crystals having a melting point of 207 to 209C is 6.5 parts.

EXAMPLE 4 The dye of the formula:

.ctr

or its isomer of the formula is obtained by following the procedure described in Example 2 but using 4.5 parts of 3-benzimidazolyl-(2 )-7- dimethylamino-Z-iminocoumarine instead of 3- benzimidazolyl-( 2 )-7-diethylamino-2- iminocoumarine.

The yield of red crystals is 5 parts and the compound is obtained by heating 4.25 parts of the dye from Example 4 with 5.6 parts of dimethyl sulfate and 130 parts of o-dichlorobenzene for 3 hours at C, then cooling to 0C, suction filtering the precipitate, washing it with 10 parts of petroleum ether and drying it. 6 parts of black crystals are obtained having a melting point of 220 to 225C.

EXAMPLE 6 The dye of the formula:

6 or the corresponding closed-ring product of the proba EXAMPLE 8 MC formula: The dye of the formula:

n 5 No H C 5 2\ N H C 5 2 CN H C N C(CN) l() H C 2 is obtained by boiling 4.98 parts of 3-bcnzimidazolyl- 5 2 (2')-7-diethylamino-Z-iminocoumarine and 1.47 parts of methyl cyanoacetate in 45 parts of glycol monoethyl is Obtained by boiling parts of 3 (p nitr0phenyl) 7- other for two hours thirty minutes. under reflux, then diethylaminmliminocoumarine and 066 part of f to Suction filtering the red c rystals* Wash lononitrile in 45 parts of glycol monoethyl ether for 1 "8 them with 10 Parts of alcohol The hour under reflux, then cooling to 5C, suction filtering yield Parts and the meltmg pomt 240 the deposited substance, washing it with l() parts of EXAMPLE 7 ethanol and drying it. ("The yield of red crystals having 0 a melting point of 296 C 1s 3 parts. The dye of the formula: 2 I

EXAMPLE 9 CH 3 The dye of the formula: H C

3 N C(CN) -C()OCH;, or its isomer of the formula: S

o C(CN is obtained by boiling 3.28 parts of 3-(5- carbomethoxy )-thenyl-( 2 )-7-dimethylamino-2- iminocoumarine and 0.66 part of malononitrile in parts of glycol monoethyl ether for one hour under reis obtained by boiling 3.18 parts of 3-(5'-methyl)- flux, then cooling to 5C followed by suction filtration benzimid z lyl-(2)-7- m y i ,40 and washing with 10 parts of methyl alcohol. After dry- I iminocoumarine and 0.66 parts of malononitrile in 45 ing, 3 parts of red crystals having a melting point of parts of glycol monoethyl ether for one hour under re- 244 to 246C are obtained. flux, then cooling to 5C, suction filtering, washing with 'ln a manner analogous to that described in the Exam- 10 parts of ethanol and drying. 3 parts of dark red crysples the dyes characterized in. the following Table by tals are obtained having a melting point of 312C. 45 their substituents are obtained:

R5\ CN N 0 C R" Y Ex. R Y R Shade on polyester 10 CH coocll, 00M yellow l 1 C H,, COOC2H5 --CN yellow 12 c cooqn, @CN yellow 13 C H CON H --CN yellow l4 c ll, CON(CH;,)2 CN yellow 15 (12H; CONHQJ'I; CN yellow 16 c. .H y- CONGO @CN yellow Continued Ex. R" Y R Shade on polyester S 58 (1H,, (N l yellowish I'Ctl CH CH=OH s S9 H C'OOC H; yellowish rcd Polyester 60 H CN 9 -CN ycllow 61 C- ,H CN QSO NH yellow 62 C- ,H C N 9 -SO CH;, yellow 63 C-,H CN QBr yellow 64 C H CN pSO C-:H yellow 65 C H CN H red EXAMPLE 66 is obtained b stirrin 7.1 arts of 3-(5- y g P The dye of the formula. carbomethoxy)-thenyl-(2)-7-diethylamino-2- is obtained by stirring 4.8 of 3-(5' EXAMPLE 67 The dye of the formula:

iminocoumarine and 1.5 parts of malononitrile in 70 parts of glycol monoethyl ether for -l hour at C, then cooling to 5C, suction filtering, washing with 1() parts of methanol and drying. The yield is 6.4 parts and the melting point is 218 to 220C.

EXAMPLE 68 The dye of the formula:

is obtained by stirring 5.7 parts of 3-p-cyanophenyl-7- dimethylamino-2-iminocoumarine and 30 parts of isobutyl cyanoacetate for 30 minutes at C, then cooling to 5C, suction filtering, washing with 10 parts of methanol and drying. The yield is 5.5 parts and the melting point is 227 to 228C.

EXAMPLE eff; I

The dye of the formula:

is obtained analogously to Example 68 from 5.7 parts of 3-p-cyanophenyl-7-dimethylamino-2- iminocoumarine and parts of methyl cyanoacctatc. The yield is 5.1 parts and the melting point is 268" to 7 EXAMPLE 70 The dye of the formula: I i i is obtained analogously to Example 68 from 6.3 parts of 3 p-cyanophenyl-7diethylamino-2iminocoumarine EXAMPLE 71 The dye of the formula:

t and 30 parts of isobutyl cyanoacetate. The yield is 4.9

parts and the melting point is 214 to 216C.

is obtained analogously to Example 68 from 6.3 parts of 3-p-cyanophenyl-7-diethylamino-2-iminocoumarine and 30 parts of ethyl cyanoacetate. The yield is 2.4

parts and the melting point is 200 to 202C.

EXAMPLE 72 The dye of. the formula:

is obtained analogously to Example 68 from 6.3 parts of 3 p cyanophenyl-7-diethylamino-Z-iminocoumarine and 3.0 parts of methyl cyanoacetate. The yield is 5 parts and .the. melting point is 248 to 250C.

EXAMPLE 73 Treatment of the dye ofExample 2 with concentrated sulfuric acid: 7

6.5 parts of the dye from Example 2 is introduced with stirring at about 20C into 28 parts of 98% sulfuric acid a nd stirre d for 4 hours at 20C. The solution is then poured slowly into a mixture of 1000 parts of watcr and 1000 parts of ice. 500 parts of saturated EXAMPLE 74 10 parts of 2-irnino-3( 3 ',4'-dihydro-4" oxoquinazolin-yl-Z )-7-diethylaminocoumarine is heated in parts of ethyl cyanoacetate for 1 hour at 80C and 3 hours at C. After cooling, the dye is suction filtered. washed with methanol and dried. 7 parts of the dye of the formula:

is obtained. It has a melting point of 210 to 212C.

The dyes in which R is methyl have very similar properties; the shade of the dyeings shows a hypsochromic shift.

We claim: 1. A fluorescent dye of the formula wherein: A is hydrogen; and

R is hydrogen; alkyl of one to four carbon atoms n is zero.

which may bear methoxy, ethoxy, chlorine, bro- 3. The dye of the formula as claimed in claim 1 mine, carboxyl, carbalkoxy of 1 to 4 carbon atoms wherein: in the alkoxy portion. carbamoyl or acetoxy; cyclo- 5 R and Rifeach is ethyl: hexyl, benzyl or phenyl; Y is cyanoafj R is hydrogen; alkyl of one to four carbon atoms is methyl which may bear as a substituent methoxy, cthoxy, If; is l; and chlorine, bromine, carboxyl, carbalkoxy of l to 4 X; is the itliofl CH;,SO.,". carbon atoms in the alkoxy portion, carbamoyl or m 4. The dye of the formula as claimed in claim 1 acetoxy; whef inzI- T Y is carbalkoxy of l to 4 carbon atoms in the alkoxy Ri' and R;- cach is ethyl;

portion; unsubstituted carbamoyl; N-alkylor Y is cO CH N,N-dialkylcarbamoyl of a total of up to 8 carbon A is hydrogen; and atoms in the alkyl portions; phcnylcarbamoyl; n is zer" cyclohexylcarbamoyl; benzylcarbamoyl; or cyano; 5. The dye of the formula as claimed in claim 1 A is hydrogen, methyl, ethyl, fi-hydroxyethyl or B-hywherein R and R each is alkyl of l to 4 carbon atoms. droxypropyl; 6. The dye of the formula as claimed in claim 1 R is hydrogen or methyl; wherein R and R each is methyl or ethyl. n is zero or 1; and 7. The dye of the formula as claimed in claim 1 X is an anion. wherein n is zero. 2. The dye of the formula as claimed in claim 1 8. The dye of the formula as claimed in claim 1 wherein: wherein Y is cyano.

R and R each is ethyl; I 2 9. The dye of the formula as claimed in claim 1 Y is cyano; wherein Y is carbamoyl.

UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,904,642 DATED September 9, 1975 INV ENTOR(S) MACH et al It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

, e In Column 1, Line 47, delete "X and substitute X In Column 2, Line 5, delete y and substitute Y e In Column 2, Line 6, delete X and substitute X In Column 7, the structure in the column heading under R for examples l7 and 18 should be G In Column 15, Line 22, delete "X and substitute X In Column 16, Line 9, delete CH SO4 and G substitute (1H3S04 Signed and Sealed this [SEAL] Seventh D3) f September 1976 Attestf RUTH C. MASON Arresting Officer C. MARSHALL DANN Commissioner oflalenrs and Trademarks 

1. A FLUORESCENT DYE OF THE FORMULA
 2. The dye of the formula as claimed in claim 1 wherein: R1 and R2 each is ethyl; Y is cyano; A is hydrogen; and n is zero.
 3. The dye of the formula as claimed in claim 1 wherein: R1 and R2 each is ethyl; Y is cyano; A is methyl; n is 1; and X is the anion CH3SO4 .
 4. The dye of the formula as claimed in claim 1 wherein: R1 and R2 each is ethyl; Y is -CO2CH3; A is hydrogen; and n is zero.
 5. The dye of the formula as claimed in claim 1 wherein R1 and R2 each is alkyl of 1 to 4 carbon atoms.
 6. The dye of the formula as claimed in claim 1 wherein R1 and R2 each is methyl or ethyl.
 7. The dye of the formula as claimed in claim 1 wherein n is zero.
 8. The dye of the formula as claimed in claim 1 wherein Y is cyano.
 9. The dye of the formula as claimed in claim 1 wherein Y is carbamoyl. 